摘要
脉冲电流热加工(pulseelectriccurrentheattreatment,PECHT)具有低温、快速的特点。研究了脉冲电流烧结过程中温度和脉冲比对Fe烧结体性能的影响,并与相同温度、压力和保温时间下辐射加热热压烧结的Fe烧结体进行了比较。结果表明:脉冲电流烧结在较低温度下样品就能获得更高的致密度。脉冲比(ON/OFF)对烧结有很大影响,说明脉冲电流加热促进了颗粒之间的原子扩散。同时,脉冲电流加热烧结和辐射加热烧结过程中Al2O3和Cu的收缩曲线也为脉冲电流加热条件下扩散加强提供了佐证。2种加热条件下接触线之间原子扩散的研究表明:脉冲电流加热促进了原子的扩散。
Pulse electric current heat treatment (PECHT) is an innovative technique of materials preparation in lower temperatures and fast speed. The effects of temperatures and ON/OFF on properties of Fe sintered were studied by pulse electric current (PEC) heating, and to compare with that sintered by hot press of radiation heating under same conditions of temperature, pressure and holding time. The results indicate that higher relative density could be achieved for the sample sintered at lower temperatures under PEC heating, and ON/OFF has an important effect on PEC sintering, demonstrating that PEC heating promotes atom diffusion between powder particles. The result was further proved by the shrinkage curve of Al_(2)O_(3 )and Cu during the processes of PEC sintering and radiation heating sintering. The study on atom diffusion at the contacting line under both PEC heating and radiation heating also indicates that PEC accelerates the atom diffusion.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第4期416-421,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(5992507
50272047)资助项目。~~
关键词
脉冲电流热加工
扩散
接触点
接触线
烧结
pulse electric current heat treatment
diffusion
contacting point
contacting line
sintering
